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Lycoming carb question

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dpersyk(at)worldnet.att.n
Guest

Posted: Thu Jun 12, 2008 8:45 am Post subject: Lycoming carb question

 	  Quote: 	
		   Time: 12:27:45 PM PST US

 From: Knicholas2(at)aol.com

 Subject: Lycoming carb question.

Hi Kim,

Flight instruments aside, does the engine behave like it is too lean when 

the mixture knob is in at cruise less than 75% power?  That is, if you 

slowly lean, does the EGT decrease?

If you are in fact flying lean of peak, the exhaust temps will be less than 

peak because the cooling is coming from excess  air instead of excess fuel. 

I guess I don't understand your "high EGT" temps if your readings are at 

cruise configuration. All the EGT instruments I'm familiar with indicate 

relative temps.

I'm not saying you don't have a lean carb problem -  just curious if the 

simpler determination of mixture gives the same indication.

Good landings,

Dennis

N600DP 6a sold http://home.att.net/~dpersyk/rv6a.htm

 	  Quote: 	

 I have an 0-320 E2D in my RV9A and have fighting high CHT's.  The  engine

 monitors suggest that the engine is running too lean,  therefore 

 contributing

 to

 the high CHT and exhaust temps.  I learned yesterday that  lycoming

 apparently makes 2 different carbs for this engine.  One  runs 

 leaner/richer than

 the

 other.  One of the guys in my EAA chapter said  that he had the same 

 problem

 with his 0-320 until he changed to a richer running  carb and now has no

 problems.

 Can anyone tell me which carb for the 0-320 is the one that runs  rich?

 Thank you.

 Kim Nicholas

 RV9A

 Auburn, WA

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Knicholas2(at)aol.com
Guest

Posted: Thu Jun 12, 2008 2:26 pm Post subject: Lycoming carb question

Thanks for the interest.  Yes,  everything points to a lean  running engine.  Another RV-lister sent me information that it is common  for the 10-5009 carbs to run lean.  He is send me a new carb jet  (apparently there was a Lycoming service bullitin about it)  to make it run  more rich.  I will post my results on the list.

  

 Regards,

  

 Kim Nicholas

  

  In a message dated 6/12/2008 9:48:35 A.M. Pacific Daylight Time,  dpersyk(at)worldnet.att.net writes:

  	  Quote: 	
		  -->    RV-List message posted by: "Dennis Persyk"    <dpersyk(at)worldnet.att.net>



 	  Quote: 	
		   Time: 12:27:45 PM PST US

    From: Knicholas2(at)aol.com

 Subject: Lycoming carb    question.


	


Hi Kim,



Flight instruments aside, does the    engine behave like it is too lean when 

the mixture knob is in at cruise    less than 75% power?  That is, if you 

slowly lean, does the EGT    decrease?



If you are in fact flying lean of peak, the exhaust    temps will be less than 

peak because the cooling is coming from    excess  air instead of excess fuel. 

I guess I don't understand your    "high EGT" temps if your readings are at 

cruise configuration. All the EGT    instruments I'm familiar with indicate 

relative temps.



I'm    not saying you don't have a lean carb problem -  just curious if the    

simpler determination of mixture gives the same    indication.



Good landings,



Dennis



N600DP    6a sold http://home.att.net/~dpersyk/rv6a.htm

 	  Quote: 	
		  

 I have    an 0-320 E2D in my RV9A and have fighting high CHT's.  The     engine

 monitors suggest that the engine is running too lean,     therefore 

 contributing

 to

 the high CHT and exhaust    temps.  I learned yesterday that  lycoming

 apparently makes    2 different carbs for this engine.  One  runs 

 leaner/richer    than

 the

 other.  One of the guys in my EAA chapter    said  that he had the same 

 problem

 with his 0-320 until    he changed to a richer running  carb and now has no

    problems.



 Can anyone tell me which carb for the 0-320 is the    one that runs  rich?



 Thank you.



 Kim    Nicholas

 RV9A

 Auburn,  es  y       -->                 - MATRONICS WEB FORUMS  nbsp;               - List Contribution Web Site  ;                             =========================


	


	




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